脉冲电流辅助波-平轧制Ti-6Al-4V钛合金异构组织形成机理与强韧机制

doi:10.3901/JME.260169

摘要/Abstract

摘要： 针对传统工艺制备Ti-6Al-4V钛合金板材长期面临的强塑性倒置难题，将电场集成到波-平轧制过程中，在板材中构筑等轴状粗晶与超细晶混合的双峰异质结构组织，从而实现板材强塑性匹配的提升。对比研究了在600 A脉冲电流作用下，轧制温度为720 ℃与820 ℃的电辅助波-平轧制及电辅助平轧板材间的微观组织和力学性能差异。结果表明，在首道次电辅助波纹轧制中，受波纹辊轧制产生的非均匀塑性变形作用，导致在脉冲电流影响下板材从波峰至波腰、波谷处，材料产生局部微观组织调控效果，并经后续多道次电辅助平轧，最终在板材中制备出双峰异质结构组织。与电辅助平轧相比，电辅助波-平轧制板材中再结晶程度显著提高，并产生织构弱化现象，通过晶粒细化和异质结构组织所产生的细晶强化、位错强化和异质变形诱导强化等强化机制，使其强度大幅提高，同时借助异质变形诱导硬化机制使板材保持较高的塑性，表现出优异的强塑性均衡。其中，在720 ℃轧制温度条件下经电辅助波-平轧制后板材的异质结构效果最为明显，该板材的抗拉强度达到1 330.6 MPa，屈服强度为1 191.5 MPa，并保持了11.9%的断后伸长率。

关键词: 波-平轧制, 电辅助轧制, 异质结构, 微观组织, 力学性能

Abstract: Aiming at the long-term inversion problem in the strength and plasticity of Ti-6Al-4V titanium alloy plate prepared by traditional processes，an electric field is integrated into corrugated-flat rolling to form a bimodal heterogeneous structure with equiaxed coarse grains and ultrafine grains，thereby improving the strength and plasticity matching of the plate. The differences in microstructure and mechanical properties between electro-assisted corrugated-flat rolling and electro-assisted flat-rolling plates at 720 ℃ and 820 ℃ under a 600 A pulse current are compared. The results show that in the first pass of electro-assisted corrugated rolling，due to non-uniform plastic deformation caused by corrugated roll rolling，the material's local microstructure control effect is produced from the peak to the waist and the trough of the plate under the influence of the pulse current. After subsequent multi-pass electro-assisted flat rolling，the bimodal heterogeneous structure is finally prepared in the plate. Compared with electro-assisted flat rolling，the recrystallization degree in the electro-assisted corrugated-flat rolling plate is significantly improved，and a texture-weakening phenomenon is observed. The strength is greatly improved by the strengthening mechanisms such as fine-grain strengthening，dislocation strengthening，and heterogeneous deformation-induced strengthening，produced by grain refinement and heterogeneous structure. At the same time，the plate retains high plasticity through a heterogeneous deformation-induced hardening mechanism，demonstrating an excellent balance of strength and plasticity. Among them，the heterogeneous structure effect of the plate after electro-assisted corrugated-flat rolling at 720 ℃ rolling temperature is the most obvious. The tensile strength of the plate is 1 330.6 MPa，the yield strength is 1 191.5 MPa，and the elongation after fracture is 11.9%.

Key words: corrugated-flat rolling, electrically assisted rolling, heterostructure, microstructure, mechanical properties

中图分类号:

TG335

张志雄, 赵睿琦, 王伯霖, 张斯沫, 王斌. 脉冲电流辅助波-平轧制Ti-6Al-4V钛合金异构组织形成机理与强韧机制[J]. 机械工程学报, 2026, 62(12): 216-230.

ZHANG Zhixiong, ZHAO Ruiqi, WANG Bolin, ZHANG Simo, WANG Bin. Formation Mechanism and Strength-toughness Mechanism of Heterogeneous Structure of Ti-6Al-4V Alloy by Pulse Current Assisted Corrugated-flat Rolling[J]. Journal of Mechanical Engineering, 2026, 62(12): 216-230.

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链接本文: http://www.cjmenet.com.cn/CN/10.3901/JME.260169

http://www.cjmenet.com.cn/CN/Y2026/V62/I12/216

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